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This exception has no message.
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This exception has no message.
java.lang.NullPointerException at java.util.Arrays.mergeSort(Arrays.java:1124) at java.util.Arrays.mergeSort(Arrays.java:1131) at java.util.Arrays.sort(Arrays.java:1074) at java.util.Collections.sort(Collections.java:110) at assign11.main(assign11.java:35)